SPUTNIK / SCIENCE PHOTO LIBRARY SPUTNIK / SCIENCE PHOTO LIBRARY
Water pollution. Dead fish with malignant tumours on their skins caused by pollution. The presence of the tumours indicates that the fish have been exposed to cancer-causing (carcinogenic) chemicals which have interfered with the fishes' genetic material. Photograph of fish from the Moskva River, Russia. This river passes through Moscow & a number of other urban areas, and is heavily contaminated with industrial pollution.
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